Bark-stripping machine



March 18 1930. VQGL 1,751,258

. BARK STRIPPING MACHINE I Filed July 3. 1928 3 Sheets-Sheet 1 I Invenfor:

Huber?" V034 March 18, 1930. H. VOGL ,7

BARK STRIPPING MACHINE Filed July 3,1928 3 Sheets-Sheet 2 Y .Iiqi.

lnvenforf: Huber-f Vo 9"/, b W'Mf/Q March 18, 1930. H. VOGL 1,751,258

BARK STRIPPING MACHINE ,Filed July 5, 1928 .3 Sheets-Sheet 3 [/7 venfor:Hub e r- 7" Vqyk 4y Wa- W70 Patented Mar. 18, 1930 UNITED STATES HUBER!VOG-L, or NEU urnnasnonr, nusram :BAnx-srmrrme iracnnm Application filedJuly 3, 1928, Serial 1T0.

This invention relates to a bark stripping machine, and its essentialfeature consists in that a drunken saw blade, which removes thebranches-and the like from the tree or trunk,

s is arranged in front of the actualstripping tool, for instance acutter or the like.

It is already known to arrange on the machine a. preliminary cutter infront of the actual stripping cutter. However compared with this knownarrangement the use of a drunken saw blade constitutes a considerableadvance because the unevenness of the trunk can be more readily andsatisfactorily removed owing to the axial movement of the IE teeth ofthe drunken saw blade.

Further this invention relates to an arrangement by which the strippingtools can be correctly and securely applied to trunks of differentdiameters.

According to the present invention this object is attained in that theswinging arm carrying the stripping tools is guided partly on the trunksand partly on projections, which are fed forward with the same speed asthe trunks. Thereby the advantage is attained, that the machineautomatically adapts itself to trunks of diiierent thickness in that theprojections lift the swinging arm during the passage of the intermediatespaces between the trunk to such an egrtent, that the said arm is placedon top of the thickest trunks to be treated by the machine.

Further this invention relates to the cur ployment of the drunken sawblade for the preliminary work as well as for the finishing work,because in consequence of the high number of revolutions the cutter isnot strong enough for this kind of work and further roughens thesurface.

Compared with the use of a single saw blade, by connecting a number ofdrunken saw blades into groups according to the present invention theadvantage is attained that the anal total outward swinging of the sawblades of about 6 centimetres, necessary for a rafional forward feed, isobtained at a smaller inclination of the same, whereby the unde-'sirable outward swinging of the saw blades is reduced. j

Instead of contacting means a guide roller 290,208, and Austria June 28,1927.

can be employed, which produces less friction and prevents anyinterruption by hanging to branches and so forth. The guide roller canbe vertically adjusted in a vertical slot by means ofja screw in orderto compensate for the reduction ofthe diameter of the saw blade inconsequence of grinding.

Two modes of carrying out the presentinvention are illustrated by way ofexample in the accompanying drawings in which- Fig. 1 shows one form ofthe machine in front view.

Fig. 2 illustrates a detail in firont view, and

Fig. 3 a'.detail in side view.

A second construction is shown in Fig. 4: in side view, and in Fig. 5 infront view.

Fig. 6 shows on an enlarged scale and in side view a trunk, whichissubjected to the treatment of a drunken saw blade, whereby 79 howeverthe projection is not operative.

Fig. 7 illustrates the position of the drunken saw blade when sub ectedto the action of. the projection, before a trunk has been pushed.forward suficiently and can be treated by the drunken saw blade.

Figs. 8 and 9 show the projection in the position in which theroller-box has passed be! yond the highest point and slides downward,whereby at the same time the head of the tool 89 is laced on the trunk.

igs. 10 and ll illustrate the highest position of the roller-box on theprojection, whereby the head of the tool does not yet rest on the trunk.Fig. 12 illustrates the driver with ball-hearroller, and V Fig. 13 thevertical adjustability of the guide-roller.

in the construction shown iii'Figs. 1, 2 and 99 3, the trunk 1 rests ontwo grooved rollers 2 and 3, which are rotated in the direction of thearrows whereby the trunk is rotated past the drunken saw blade 4: andthe cutter 5 (Fig. 3). These two tools are rotated by means ofchain-wheels 6 and 7. The swinging bearing arms 8 of the tools areprovided with contacting Icons 9, l0,-which set the depth of penetrationof the tools. The drunk- 100 en saw blade 4. removes the rough remainsstrips the bark from the latter. A chain 11 of the branch from thetrunk, while the cutter serves for feeding the trunk and is providedwith an upwardly directed arm 12, which drives the trunk.

In the construction shown in Figs. 4 to 13 a pair of drunken saws 4 arearranged on the shaft of an inclined swinging arm 8, the said pair beingdriven by a chain-wheel 6 at a speed of about 3000 revolutions perminute.

All rotations are derived from a shaft 13, which is driven by a motorat'a s eed of about 1000 revolutions per minute an on which is keyed aworm 14, meshing with a wormrwheel 15. The latter rotates, through theshaft 16 and a change speed gear 17, two chain-wheels 18 and 19. Thegrooved rollers 2 and 3 are rotated by a chain 20, which is driven bythe shaft 13. If desired gear wheels may be interposed and the drunkensaw 4 may be operated by a chain operated by a chain drive 21 and 22,whereb the ratio betweenthe chain-wheels 21 an 6 is in the proportion ofoneto three.

An endless chain 24, which preferably is secured against sagging, passesover the chain-wheel 19 and a similar chain-wheel 23, the said chainbeing provided with projections 25 which are placed some distance apart,four projections being shown in the drawing. T e distance between theprojections is approximatel one meter and twenty five centimeters, whichcorresponds to the length of one trunk which is one meter increased bythe space between the trunks fed to the machine which is about 25centimeters.

A set of'rollers formed by three rollers 26, 27, 28 is guided by the proectlon 25 and is disposed in an extension 29 of the swinging arm 8. Whenthe saws are in line with the space between trunks or logs, the drunkensaws mounted on the swinging arm 8 are lifted by the roller 26 runningup the sli htly inclined track of the projection 25 igs. 10 and 11) and,during the downward sliding of the roller 28 over'the hi her or moreinclined art of the track of t e pr0 jection 25, the runken saws rest onthe trunk (Figs. Sandi); which now acts as guide b means of a rol er 31,which is vertically a justable on the arm 8 by, a screw 30. The

chain-wheels 18 and 19 of like size can be changed against otherchain-wheels of a diameter corres ondin to the forward feed according tot e thic ness of the trunk, because thinner trunks possess a highangular s eed at the same number of revolutions of t e grooved rollersand therefore call for a greater feed andvice versa. The change speedgear 17 serves to accelerate the forward feed of the feed-chain 11(and-24 respectively) during-the movement of the intermediate spacebetween trunks past the tools, e. g. during the rotation of. the set ofrollers 26, 27, 28 upon the projection 25 the feed of the feed-chain 11and 24. respectively) is v accelerated, in order to save time. I A ball32 is mounted freely rotatable in the driver-arms 12, in order toprovide for a conveyance of the trunks without friction, as otherwisethe rotatin trunks would stick to the drivers or be sub ected to aconsiderable braking action.

A workman can attend to three machines at a time and he has to takecare, that a new trunk 1 is continuously placed onto the grooved rollers2 and. 3as soon as the driver 12 appears from below.v

1. In a machine for stripping the branches and then the bark from logs,the'combination of means for simultaneously rotating and conveying thelogs longitudinally thereof, means for strippin the bark from the logs'during rotary an longitudinal movement, and swinging angularly disposedrotary driven cuttlng means for strippin the branches from the logs inadvance 0 the means forstripping the bark.

2. In a machine for stripping the branches and then the bark from logs,the combina tion of means for simultaneously rotating and .conveying thelogs longitudinall thereof, swinging means for stripping the bark fromthe logs during rotary and longitudinal movement, and swinging rotarydriven cutting disc disposed at an angle to the axis of rotation thereoffor strippinglthe branches from the logs in advance of t e means forstripping the bark.

3. In a machine for stripping the branches and then the bark from logs,the combination of means for simultaneousl rotating and conveying thelogs longitu allyrthereof,

one after another, means for stripping the barkfrom the logs duringrotary'and longitudinal movement, rotary driven cutting disc disposed atan an le to the axis of rotation thereof for stripplng the branches fromthe log in advance of the means for stripping the bark, and pivotalcarrying arms for'the bark and branch stripping means, whereby thelatter follow the contour of the log.

4. In a machine for stripping the branches and then the bark from 10 thecombination of means for simultaneous y rotating and conveying the logslongitudinally thereof, a rotary driven cutter for stripping the barkfrom the log during rotary and longitudinal movement, a rotary drivencutting disc disposed at an angle to its axis of rotation for strippingthe branches from the logs, pivoted arms carrying the bark cutter andbranch stripping disc, the latter being arranged to remove the branchesin advance of the cutting disc, and means carried at the free end of eacarm and radially of the centers of the axes of the cutting disc andcutter for supporting the arms by resting on and following the 'contourof the moving log to hold the cutting edge of the disc and cutter inproper cutting position with respect to the log.

5. In a machine for stripping-the branches and then the bark from logs,the combination 5 of means for supporting and rotating the log about itslongitudinal axis, conveying means for conveying the log longitudinallyof its 7 am's alon said first means, arms pivotally supporte andprovided with projections on 30 their free ends to rest on and ride overthe surface of the log in rotary and longitudinal motion, a rotarydriven cutter carried at the free end of one of the arms to remove thebark from the log, a rotary driven cutting disc dis osed at an angle toits axis of rotation and carried at the free end of the other arm toremove the branches from the log in advance of the bark removing cutter,and means for supporting the arms to prevent the lowering between thepassing ends of adjacent logs.

6. In a machine for stripping the branches and bark from a log duringsimultaneous rotary and longitudinal movement thereof, pivoted armsresting at their free ends on the log for supporting cutting elements incutting contactwith the surface of the log, and means travelinglongitudinally with and disposed between the ends of succeeding logs tosupport the arms and cuttinglelements during the passing of the ends oft e logs under the cutting elements.

7. In a machine: for stripping the bark and branches from logs, meansfor rotating and supporting the logs, a conveyor for moving the ogslongitudinally, one following the other and operating between therotating and supporting means, means arranged on the conveyor at spacedintervals to engage bea tween the ends of adjacent logs, separate rotarydriven cuttin means for first remo the branches and t en the bark fromthe rotating' 10 as they pass, bell crank levers carrying e cuttingmeans on one set of their 5 free ends, the other free ends beingdisposed 'in the path of the log'engaging means on the conve 'or, thelevers engzglkng the last mentione means and beingr e to pport thecutting means independently of the 0g dur 5o ing the interval betweenthe pasing of the end of one log and the beginning of the next beneaththe cutting means.

IntestimonywhereofIaflixmysignature. V r 7 HUBERT VOGL.

